Unable to select Dragon Age Origins: Awakening specializations

Exactly what the title says, really.

My character/companions are level 23, so they have three specialization points. I purchased the manuals for the new specializations like you're supposed to: example being the Battlemage manual from Vigil's Keep. I can select the specs from Origins just fine, but the boxes for Battlemage and Keeper on the level-up screen are still grayed out, despite being fully unlocked according to the tooltips. The same goes for the Rogue (Shadow and Legionaire Scout) and Warrior specs (Guardian and Spirit Warrior). I disabled my mods that only do anything in Origins (all two of the mods I use for this entire game: Hide Helmet for Origins and Manual of Focus for Origins), but this did nothing.

What did I do wrong, and how do I fix it?